Implicações estruturais dos erros de execução em treliças planas metálicas destinadas ao vigamento principal de pontes retas ferroviárias

Abstract

Flat trusses are used in a variety of applications, including to make up the main girder of a straight bridge. They are commonly used in road or railway bridges with medium to long distance spans, as they have a large load capacity. It is essential to correctly execute this type of structure, so that there is a good performance of its operation. Therefore, this work deals with the evaluation of a lattice structure that will serve to compose the main frame of a straight railway bridge, idealized in the region of Greater Recife as a case study, where two different types of construction forms will be analyzed: one executed following the parameters determined by the structural design and the other with executive errors. The comparative analysis showed that the error due to eccentricity of 150 mm in some connections in the profiles, caused the truss to behave as a flat frame, generating cutting and bending forces, where it was verified the need to increase the gauge of the profiles, in approximately 64% of the steel area, to support the requests arising from the execution error. increasing the costs of the work.